How much steering lock do most of you use?

With a setup station I always try to get 21 degrees lock (at inner wheel) with the dual rate at 100%. On track I would adjust this if I need less steering, but I feel this only works to a point, anything less than 80 to 85% dual rate (maybe only 18 degrees steering lock) should be solved with car and tire setup.

Some tracks have so much traction that with I can only setup the car with max. 17 or 18 degrees steering to not griprol, front tires only applied 2mm of additive. With a touringcar I know what steps to take to make the car behave like I want. 12th scale and foam is somewhat new to me ;-)